1. Department of Trauma and Orthopaedics, St George's Hospital, St George's University Hospitals National Health Service Foundation Trust, London, United Kingdom
2. St George's Medical School, St George's University London, St George's University Hospitals National Health Service Foundation Trust, London, United Kingdom
3. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom